1970 340 Carburetor

[Lunchbox]

The carb was MIA on my car when I got it. My car a 340, manual trans, with A/C.

Page 14-50 states

"The Carter four barrel carburetor models C.A.S. (Cleaner Air System) AVS-4933S, AVS-4934S, and AVS-4935S are used on the 340 cu. in. engines, when the vehicles are equipped with manual or automatic transmission respectively. AVS-4935S is used with vehicles with air conditioning only, and has a hot idle commentator valve."

and Page 14-124

It looks like the AVS-4933S would be the correct carb for my set up, if I'm reading this right.

 

[Lunchbox]

So my question would be is if I follow the parts catalog correctly it looks like there should not be an idle solenoid on this carb, any confirmation would be appreciated.

 

[pschlosser]

Agreed, the parts catalog is NOT showing there is an idle speed solenoid in your 4933S application.

 

[Lunchbox]

Agreed, the parts catalog is NOT showing there is an idle speed solenoid in your 4933S application.

Thanks for the clarification, kind of had me scratching my head when I cam across one listed on ebay that does have it.

this looks like a K9 or Nov of 69 if I am reading that right, the one I have sourced is a E0 or May of 70 manufacture date which does not have the solenoid.

 

[pschlosser]

The parts books shows the AVS carbs issued with the 340-4 was absent on CAS cars, present on ECS.

That said, my observation is the majority of vintage AVS carburetors originally equipped with these solenoids will be missing them. It's on the rare side, the used carb is sold with the solenoid. The majority of the solenoids get removed over the years as unnecessary, by tinkering owners.

 

[pschlosser]

If you're looking at the date code, just make sure its a month or two before the production date on the door sticker. I looked at that carb on ebay, and it looks like someone spent a lot of time cleaning it up and making it look nice(r)

 

[Katfish]

No idea what's correct, but AC cars usually benefit with an idle solenoid.

• Anti-Dieseling: When the ignition is turned off, the solenoid de-energizes and retracts, allowing the throttle to close fully.
• Idle Maintenance: When active (key on), the solenoid plunger extends to hold the throttle open at the correct, higher, regulated speed.
• A/C Compensation: On vehicles with air conditioning, the solenoid ensures the engine does not stall due to the added load when the compressor is running.
• Application: Commonly found on 1970 Mopar performance engines (e.g., 340 Six-Pack, 440s) to manage specific carburetor, often Holley, idle settings.

 

[AUSTA]

My A66 late 69 auto has a K9 4934S
I also bought a new old stock Holley made in Japan under licence from Dodge as a replacement for the K9 4934S body is made in Japan float bowls are made in the USA

 

[moparleo]

It show the 4935S is for a/c only.

GENERAL INFORMATION 340 Cubic Inch Engine The Carter four barrel carburetor models C.A.S.(Cleaner Air System) AVS-4933S, AVS-4934S and AVS4935S are used on the 340 cu. in. engines, when the vehicles are equipped with manual or automatic transmissions respectively. *** AVS-4935S is used with vehicles equipped with air conditioning only, and has a hot idle compensator valve. This valve is a thermostatically operated air bleed, to relieve an overrich condition at idle. This condition is the result of excessive heat and resultant overrich mixtures.*** (Fig. 2).The Carter four barrel carburetor models E.C.S.(Evaporation Control System) AVS-4936S and AVS4937S are also used on the 340 cu. in. engines when the vehicles are equipped with a manual or automatic transmission respectively. These two carburetors are also equipped with a hot idle compensator valve as is AVS-4935S above. (Fig. 1).All of these carburetors have a fast curb idle speed solenoid mounted on the carburetor opposite the throttle lever side. (Fig. 1). This solenoid is used to maintain a higher idle speed when the vehicle is running and allows the throttle to close to a low idle speed position when the ignition key is turned off, to prevent "after running."

This a direct reprinting from the 1970 Dodge Challenger Factory Service Manual section 14 pages 50,51 .